Compile the pattern for PatternFormatter

[alganet]

The verification that was made upon the pattern was almost like a parser/tokenizer in itself.

This change leverages that behavior to introduce full pattern compilation.

When the PatternFormatter encounters a novel pattern that it has never seen before, it compiles that pattern into a 3-step CompiledPattern instance that has a search regex, a replacement pattern and instructions for the callback.

Upon seeing already compiled patterns, all the PatternFormatter has to do is perform the motions (one preg_replace_callback) of the existing compiled pattern.

Further steps for pattern canonicalization could be taken, such as normalizing equivalent patterns into a single form, so they could share the same cached space. However, that micro-optimization was too expensive and counter-productive.

This change also opens up possibilities for in-file warmup, as CompiledPattern instances are simple objects. An user could pre-compile his/her hot-path patterns beforehand to share the cache even across diferent processes.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.33%. Comparing base (abb8a25) to head (8f4650f).

Additional details and impacted files

@@             Coverage Diff              @@
##               main       #7      +/-   ##
============================================
+ Coverage     99.31%   99.33%   +0.01%     
+ Complexity      141      132       -9     
============================================
  Files            14       15       +1     
  Lines           294      302       +8     
============================================
+ Hits            292      300       +8     
  Misses            2        2              

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[Copilot]

Pull request overview

This pull request refactors the PatternFormatter to use a compiled pattern approach for performance optimization. The changes introduce a new CompiledPattern class that compiles pattern strings into regex-based search patterns with instructions for character transformation. Compiled patterns are cached statically to avoid recompilation of frequently used patterns.

Changes:

• Introduced CompiledPattern class that compiles pattern strings into regex-based search patterns with transformation instructions
• Refactored PatternFormatter to use CompiledPattern for pattern compilation and caching
• Updated test coverage to include the new CompiledPattern class

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
src/Internal/CompiledPattern.php	New class that handles pattern compilation, caching, and provides transformation logic
src/PatternFormatter.php	Refactored to delegate pattern compilation to CompiledPattern and use compiled patterns for formatting
tests/Unit/PatternFormatterTest.php	Added coverage annotation for CompiledPattern class

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